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Outputs
Each communication card supplies position data to other airplane systems through either the left or the right ARINC 629 systems buses.
The driver card supplies discrete outputs directly to other airplane systems.
Door Indication
The door indication function uses two proximity cards and get inputs signals from these doors:
*
The passenger entry doors

*
The forward cargo door

*
The aft cargo door

*
The bulk cargo door

*
The forward equipment center access door

*
The main equipment center access door.

Landing Gear/Tail Strike
The landing gear/tail strike function uses these cards:
*
A proximity card

*
An 18 channel driver card.

The landing gear/tail strike function gets inputs from proximity sensors on the nose and main landing gears. This function also gets discrete inputs from the landing gear control lever module and the alternate extend switch.
Discrete signals through the tail strike assembly also go to this function to find tail strike status.
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PROXIMITY SENSOR SYSTEM -PSEU 2 -FUNCTIONAL DESCRIPTION
Thrust Reverser
The thrust reverser function has a proximity card that gets inputs from the proximity sensors on the right engine. This function supplies fault data for the right engine thrust reverser.
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PROXIMITY SENSOR SYSTEM -PSEU 2 -FUNCTIONAL DESCRIPTION

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PROXIMITY SENSOR SYSTEM -SYSTEM TESTS

General
These are the system tests for the proximity sensor system:
*
M32021 PSEU #1

*
M32025 PSEU #2.

The system tests do a test for the correct operation and installation of the PSEUs.
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777 AIRCRAFT MAINTENANCE MANUAL

PROXIMITY SENSOR SYSTEM -SYSTEM TESTS

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PROXIMITY SENSOR SYSTEM -OPERATIONAL TESTS

General
These are the operational tests for the proximity sensor system:
*
PSEU 1-A01 -Power Supply

*
PSEU 1-A02 -Communication

*
PSEU 1-A03 -Microprocessor

*
PSEU 1-A05 -Driver

*
PSEU 1-A07 -Proximity

*
PSEU 1-A08 -Driver

*
PSEU 1-A09 -Power Supply

*
PSEU 1-A11 -Driver

*
PSEU 1-A13 -Proximity

*
PSEU 1-A15 -Proximity

*
PSEU 1-A16 -Microprocessor

*
PSEU 1-A17 -Communication

*
PSEU 1-A18 -Power Supply

*
PSEU 2-A01 -Power Supply

*
PSEU 2-A02 -Communication

*
PSEU 2-A03 -Microprocessor

*
PSEU 2-A06 -Proximity

*
PSEU 2-A07 -Proximity

*
PSEU 2-A11 -Driver

*
PSEU 2-A13 -Proximity

*
PSEU 2-A15 -Proximity

*
PSEU 2-A16 -Microprocessor

*
PSEU 2-A17 -Communication

*
PSEU 2-A18 -Power Supply.

The operational tests do a test of the operation and installation of the PSEU circuit cards.
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PROXIMITY SENSOR SYSTEM -OPERATIONAL TESTS

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777 AIRCRAFT MAINTENANCE MANUAL

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AIR/GROUND SYSTEM -INTRODUCTION

Purpose
The air/ground system (AGS) supplies air mode and ground mode signals to airplane systems.
Components
These are the AGS components:
*
Air/Ground load sensors (4)

*
Weight-on-wheels (WOW) logic cards (2)

*
Air/ground relays.

General Description
Two load sensors on each main landing gear beam send landing gear load data to the two WOW cards.
The WOW cards control air/ground relays in the ELMS. These relays supply air/ground signals to other airplane systems.
The WOW cards also send digital air/ground data through the systems ARINC 629 buses to airplane systems.
Abbreviations and Acronyms
*
ADF -automatic direction finder

*
ADIRU -air data inertial reference unit
　
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